i'm running redhat 7 on a hp vectra with a compaq mv520 monitor. whenever i try to set the resolution any higher than 640x480 i get what i like to call the "laptop effect". if you have ever used a windows laptop and have set the resolution higher than is reccommended it only shows you a portion of the screen until you move your mouse to the edge of the screen. Xconfigurator didn't have the mv520 in the monitor list so i had to input the specifications manually, so this may have something to do with my problem. but im sure that the specs i input are correct. if anyone can help i'd be grateful as i've been having this problem for a while.